2161693 has 4 divisors (see below), whose sum is σ = 2165148. Its totient is φ = 2158240.

The previous prime is 2161639. The next prime is 2161697. The reversal of 2161693 is 3961612.

2161693 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 466489 + 1695204 = 683^2 + 1302^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2161693 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2161697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 496 + ... + 2137.

It is an arithmetic number, because the mean of its divisors is an integer number (541287).

2^2161693 is an apocalyptic number.

It is an amenable number.

2161693 is a deficient number, since it is larger than the sum of its proper divisors (3455).

2161693 is an equidigital number, since it uses as much as digits as its factorization.

2161693 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3454.

The product of its digits is 1944, while the sum is 28.

The square root of 2161693 is about 1470.2697031497. The cubic root of 2161693 is about 129.2998453407.

The spelling of 2161693 in words is "two million, one hundred sixty-one thousand, six hundred ninety-three".